Hello,
as you can see in the images below icons appointments overlap with the cells of the grid.

portrait:

landscape:

code:

    calendar = [[IGCalendarView alloc] init];
    calendar.displayBackButton = NO;
    calendar.displayTitleBar = YES;
    calendar.theme = tema = [[OrdiniGiornalieriTema alloc] init];
    
    [calendar navigateToDate:[NSDate date] forType:IGCalendarViewDisplayTypeMonth];
    calendar.delegate = self;
    calendar.minYear = [data year] - 1;
    calendar.maxYear = [data year];
    [calendar setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self.view addSubview:calendar];
    
    //Constraints
    NSDictionary *views = NSDictionaryOfVariableBindings(calendar);

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[calendar]|" options:0 metrics:nil views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[calendar]|" options:0 metrics:nil views:views]];